Celebes Halfbeak Nomorhamphus Care Guide: Sulawesi Wild
The Celebes halfbeak is one of the few livebearers from outside the New World that has earned a permanent place in the hobby, and the species is unmistakable thanks to its asymmetric jaw and bright red-tipped fins. Celebes halfbeak nomorhamphus liemi reaches 6 cm and inhabits cool fast-flowing mountain streams of Sulawesi (formerly Celebes), Indonesia. The celebes halfbeak nomorhamphus is a surface-dwelling livebearer that prefers slightly cooler water than tropical baseline and rewards keepers willing to run a fan or chiller. This guide from Gensou Aquascaping at 5 Everton Park covers the husbandry essentials.
Origin and Wild Habitat
Endemic to the central Sulawesi highlands, particularly the streams around Lake Tempe and the Maros river system. Habitat is clear, fast-flowing mountain stream with rocky substrate, overhead vegetation cover, and water 22-26°C — significantly cooler than lowland tropical streams. Parameters: pH 7.0-8.0, GH 8-15, KH 4-10.
Tank Size
A small group of one male and three females settles into 60-90 litres. Larger colonies of 6-8 in 120 litres show best behaviour. Length and surface area matter more than depth — go for at least 80 cm tank length with shallow water column. Halfbeaks live in the top 10 cm of the water.
Aquascape
Build around fine sand or smooth gravel, several rounded river stones, driftwood, and floating plants providing surface cover and feeding opportunity. Riccia, frogbit, and salvinia all suit. Avoid heavily planted midwater scapes that interfere with surface swimming. Open surface space is essential.
Water Parameters
Target pH 7.0-7.8, GH 8-12, KH 4-8, temperature 23-26°C. The cool requirement is the species’ main husbandry challenge in Singapore where ambient sits at 28-31°C. A small clip-on cooling fan typically drops tank temperature 2-3°C and suffices for most installations. Add a small dose of crushed coral if Singapore PUB tap reads under GH 4.
Filtration
Moderate flow appropriate to mountain stream origin. A small canister or quality HOB suits a 60-90 litre tank. The aquarium filtration range includes appropriate options for moderate-flow community tanks.
Feeding
Surface-feeding carnivore. Floating micro-pellet, frozen daphnia at the surface, live wingless fruit flies, frozen bloodworm and live mosquito larvae form the staple. Halfbeaks have very small upturned mouths and sinking food is largely ignored. The betta food range includes some floating pellet options suitable for surface feeders.
Livebearing Behaviour
Females produce broods of 5-15 well-developed fry every 4-6 weeks after a 6-8 week gestation. Fry are 1-1.5 cm at birth and immediately surface-feeders, accepting baby brine, microworm and crushed flake. Adults rarely predate their own fry but add floating cover to give the young hiding space.
Temperament and Tank Mates
Peaceful surface schooler. Males display jaw-locking ritual combat without injury. Compatible tank mates: peaceful midwater shoalers (rummynose, peppered Corydoras for cool temperatures), small loaches, and other Sulawesi-adjacent species. Avoid pairing with surface-feeding competitors like bettas or hatchetfish.
Singapore Sourcing
Wild Sulawesi Nomorhamphus liemi arrives through Iwarna periodically at SGD 12-25 per fish, often in trio sets. Captive-bred F1 from local livebearer keepers occasionally appears on Carousell at similar pricing. Buy a starter group of 1 male and 3 females minimum. House them in a 60-90 cm tank from the aquarium tank range with tight glass lid — halfbeaks jump readily.
Common Mistakes
Three frequent errors: keeping the tank too warm (above 28°C causes chronic stress and short lifespan), using sinking food (most goes uneaten), and pairing with active surface-feeding fish that outcompete them. Address all three to keep halfbeaks alive past the first six months.
Why Halfbeaks Reward the Cool-Water Investment
The combination of livebearing, surface dwelling, asymmetric jaw, and bright red fin tips makes Celebes halfbeaks a unique display species unlike anything else in the hobby. Once the temperature challenge is solved with a fan or small chiller, they breed reliably and provide ongoing fry recruitment. Pair them with a Sulawesi-themed tank including tylomelania snails for biotope authenticity.
Related Reading
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Still Have Questions About Your Tank?
Drop by Gensou Aquascaping — most walk-in questions get answered in under 10 minutes by someone who has set up hundreds of tanks.
5 Everton Park #01-34B, Singapore 080005 · Open daily 11am – 8pm
